Transit agencies in each county with a population of one million or more, and in each county with a population of from two hundred ten thousand to less than one million bordering a county with a population of one million or more that are authorized on January 1, 1991, to provide high capacity transportation planning and operating services must establish through interlocal agreements a joint regional policy committee with proportional representation based upon the population distribution within each agency's designated service area, as determined by the parties to the agreement.

(1) The membership of the joint regional policy committee shall consist of locally elected officials who serve on the legislative authority of the existing transit systems and a representative from the department of transportation. Nonvoting membership for elected officials from adjoining counties may be allowed at the committee's discretion.

(2) The joint regional policy committee shall be responsible for the preparation and adoption of a regional high capacity transportation implementation program, which shall include the system plan, project plans, and a financing plan. This program shall be in conformance with the regional transportation planning organization's regional transportation plan and consistent with RCW 81.104.080.

(3) The joint regional policy committee shall present an adopted high capacity transportation system plan and financing plan to the boards of directors of the transit agencies within the service area or to the regional transit authority, if such authority has been formed. The authority shall proceed as prescribed in RCW 81.112.030.